Pulverizer-mill.



J. W. FULLER, JR.

' PULVERIZER MILL.

APPLIUATION FILED MAR. 15, 1911. 1,039,721. Patented Oct. 1, 1912.

4 SHEETSSHEBT l.

WiT ESSES: 69m.

ATTORNEYS.

J. W. FULLER, Jn.

PULVERIZER MILL.

APPLICATION FILED MAR.15, 1911.

1,039,721 Patented Oct. 1,1912.

4 SHEETS-SHEET 2.

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WITNESSES: 1 \NVENTOR.

f flww g W; BY

ATTORNEYJ J. W. FULLER, h.

PULVERIZEB. MILL.

APPLICATION FILED MAR.15, 1911.

' Patented Oct. 1, 19 3 4 SKEETS-SEEET3 J. W. FULLER; JR-

PULVERIZER MILL.

APPLIUATION FILED MAR. 15. 1911.

Patented Oct. 1, 1912.

4; RHEETS-SHEET 4.

mi v ATTORNEYS.

u'sefuli improvements in *mills for' grinding as I the base plate orfoundation plate upon bronze bushing f, having a top flange, as

tical sectional view, partly-in elevation, 'on

.of the mill, certain of the 1211' parts throughout the several views.

inner shoulder of the bottom-bearing, the. bushing being secured inplace preferably the ushing, these passages communicating STATES PATENTOFFICE.

JAMES w FULLER, an, or GATASAUQUA, PENNSYLVANIA.

1 7 1 I Application filed Iarch 15,

To concern": Be it known that 1,-JAMES W; FULLER,

Millsgand I. do erebydeclare the following to be wan; clear, and exactdescription of the-invention, such as. will enable. others skilled'inthe art to' whichiit appertains to make'-anduse the same.

Myinventmnrelates tocertain new and;

and pulverizing cement, ore and other like materials, requiring to befinelyreduced.

In the accompanying drawings, Figure, 1 represents a vertical sectionalview, partly in elevation, of a pulverizer mill embodyingmylimprove'mcnts. Fig. 2 represents a top plan view. thereof, Fig. 3represents a verthe line,3-3 .of Fig. 2, of the upper portion partsbeing omitted, for clearnem of illustration. .4 represents a -'crosssectional view on the li-ne H of Fig. 1. Fig. 5 represents a crosssectional view on the line 5 5 of Fig.1. Fig. 6 representsa'sectionaL-view on. thgiline 66 of Fig.1. Figs.'7, 8 and 9 represent,on a lar or scale, certain details of construction. 111g. 10. is a'detail section on line IO -IO of Fig. 1.

Similar letters of reference indicate simi- Referring to the drawing, Arepresents which the superstructure is supported, and within which ismounted therbottom-beari'ng C for the' vertical shaft or spindle B. Thebearing C is provided with side'lugs (four' in-number) having pockets 0within each of which a square nut is fitted, adapted to en gage withacorresponding screw threadedbolt a, thereby locking the bearing to thebase plate A.

Within the bottom-bearing C is fitted the shown, which rests upon acorresponding by means of countersunk screws. Buitable passages areprovided in the several internal Specification of Letters Patent.

flan' es of the bearing and in the walls of ruLvnaIznamLL.

Patented Oct.' 1, 1912. 1911. Serial No. 614,618. v

with a space in the lowermost part of the bearing, which space is incommunication by means of a pipe b with a suitable lubricator E (seeFig. 2) whereby a supply of lubricating oil may be furnished to thehearing. In the bottom of the recess referred to rests a perforatedplateb', which serves as a runway for the steel balls 6 these ballsacting as friction bearings between the plate b and the bottom plate 0,attached to and rotating with the vertical shaft or spindle B. L,

Upon the foundation plate A of the mill rests the casing F for. thepower' driven pulley G, keyed to the shaft B. As indicated in Fig. 1,.the casing F is provided with suitable side openings, of largedimensions, so that the driving belt for actuating the pulley may havefree passage. Above the casing F is located the wall section H, which isbolted to the casing F and which is likewise bolted to a superjacentsection I.

I The section I supports the die J, having 'of'metal K. IVhile thechilled surface of the die J constitutes the pu'lverizing face proper ofthe mill, nevertheless, the upper surface n of the section I is likewisea grinding surface to some extent and much of the material that entersthe mill will be subjected to attrition along this surface; so that itmay be said that the die element of the mill really consists of twoseparate but related units, one of them tthe die proper J serving as atrackway' for the pulverizer balls and the other, (the cover of thesection I along-the surfaces a) serving as a means for holding thematerial to be-pulverized. The die section J is provided with a seriesoffeet m which restupon an annular shouldeim of the section I. Thesefeet are bolted to the section I, and the interspaces between the. feetare in free communication with a series of apertures n in the sect-ionI.

The apertures n communicate with a fan chamber, whose main body portionis contained within the section II and whose cover is formed by thesection I, which-is dome shaped, so as ,to give the required capacityfor the chamber. Within the fan chamber is contained a fan, whose hub ais keyed to .the shaft,- The hub. n is provided with a subjacent annularflange n fitting a correing their functions.

that the fan blades rise in a gradual curve from a point near the baseof the central" a, made up of a number of joints covered by metalsponding groove in the top ofthe'casing and it is likewise provided witha series of inclined ribs nH The fan blades n. as "shown more'clearly inFig. 5, are substantially tangent at their inner ends to-r'an imaginarycircle, buthave a slight curvature, as indicated, so as to assist themin subserv- It will also be noted cone, ofwhich the hub 91. forms part,to

' the outer edge of the-passages n, so that the passages. n dischargeinto the fancorre- Sp0l1di1'1gly. fl. ByO1ld this region, the fan bladesare provided with a sheetmetal cover sections with butt having adownward inclination, correspond ing 'to a like dip of the fan blades attheirouter portions. It'is found that. by this construction. the fanwill cause a strong and even down draft through the annular series ofopenings n and that it will discharge an even and sustained blast ofdust-laden air through the exit opening of the section meable to airwhereby the air automatically the yo stitution or repair.

separates from the pulverized material with which it is laden and passesout: through, the

interstices of the jute or like --f abric. Thefabric serves as afilter-for any of the p111:

verized material that might tend to follow the escaped air, and,-m someinstances, a second bag of jute or the like may be super posed 'over'thefirst, if a'more complete-pr efiective filtration is required for anyparti ular conditions. 4

U on he spindle-YB vis-keyed asleeve t,

ha'vingh subjacen't annular flange fitting a of the section I. This hubtcarrie ke P, provided at its lower portion with four arms whichentersuitable pockets groove or recesses in-the pushers L, being held 'in thepins ,2, so thatthey.

space thereon by may be removed at will for purposes of sub- As shownmore fully in Fig. 9, the propelling faces. of the pushers "are madesomewhat wider than the main body portion thereof. so as to giveeasy-bearing, and theysomewhat overlap thejperiphcry of the'pulverizerballs, as indicated more clearly in Fig. 4. v

a At its upper part,theyoke P is'provided rearward and upward incline-asshown n Fig. 7. and with a series of upright blades t which latterseries is-tang'ent to a common circle.

.are intended to protect the finer texture of strips, this cover a hesame.

"amount of material fedgto the screen; i Outside of, the screens 'w ofthe upper sec- .lower'fan chamber.

U: I r psd 'wn h'a-ving, 'a

The function of. these blades is I 'toraise the "pulverized materialandto float it out'through the surroundingscreen section (now to bedescribed) aided by the exhaust'action of the lower fan already Ieferredto. p v

The screen section is provided with a 1 base T and a top V connected byintervening posts W, thereby leaving intervening spaces which areoccupied by thexscreen protectors- X; These screen protectors X: are otmuch coarser mesh than. the screens proper and the screens proper frominjury by the bom bardment of any material of considerable .size thatmight otherwise be projected against them by theaction of the fans. Thescreens proper w, of fine mesh, lie outside of the screenprotectors, asshown, and any; material that has passed the screen protectors and istoo large tov pass through the screens proper will drop back by gravityinto the die. I i

At'its'upper'portion, the mill is provided" with a depressed cover-plateZ, within which fits a bushing, f corresponding to-the bu mg .of thebottom bearing of the? mill. The fdepressed cover itselfconstitutes atop- 1 hearing within "whichthe bushing f is Se-' cured, and a cap piecef forms with the top bearing a recess for the reception of lubri--.

eating .oil from the lubi'icator which com -mun icates with said recessby the pipe 2 perforated fpartitionz closes the central, opening of thecover plate Z and permits; at

of airxtlirough said oover,-to assist'in the floating out of thapulverized material; This partition zfis provided with an open- .& h1g2(see Fig. through which the graded' material from the feedscreen Uenters the mill. The spindle Bisprovided with a gear p which mesheswitha'gear P211150 ratio. of

transmission beingsuch as to-drive't'he feed screenat the speed desiredThe hopperlO- of the feed screenmay likewise be provided with-Q 9. slideo, adjustable sov as to vary the tion of the-mill, the mill is 'incasedwith asect-ional jacket'or casing'R of sheet metal, constituting anannular chamber. in communication withjthe apertures -11,- leading tothe The parts he g 'arrangediand constructed as described, the operationof the mill is as followsi'The material to be pulverized is; supplied atthe grade and in quantity per unit of time desired, through the feedscreen I throughthe opening 2- in theplate a and through the centralspace of the. depressed cover, into the die of the mill, which, in themeantime, has been set in -motion. The material thus supplied issubjected to thercrushing and pulverizing action fofthe steel-balls, ashereinbefbre described.

time, the drawingiin of a quantity and the suetionaction of theupper -'ad 13s perforated plate 2 and by the specific con-' i lower fanscooperates to progressively remove the. finely pulverized material fromthe trackway, as-it is produced, raising it into the'upper ing it outthrough the screen protectors and through the screen. This act-ion isgreatly facilitated by the entrance of air through the struction of thelower fan which causes an effective inflow of the air laden with thepulverized material through, the openings 92. Finally, the air with itsburden of pulverized material is expelled into the discharge spout m,the pulverized material dropping through the branch m and beingcollected in any suitable receptacle, and the' air separating andpassing upwardly and outwardly through the interstices of the filter ofjute fabric m Having thus described my I claim is: v

1. In a pulverizer mill, a die section consistingo-f a trackway and aseries of pulverinvention, what izer balls cooperating with the trackwayto pulverize the material supplied to the mill,

a subjacent incline for receiving the mate-- rial to be pulverized andsupplying it to the trackway, in combination with a fan chamber locatedabove the die and in direct communication therewith, a fan chamberlocated below the die and in communication with the upper chamber, andfans contained in both fan chambers; substantially as described.

2. In a pulverizer mill, a die section consistinggof a trackway and aseries of pulver-' izcr balls cooperating with the trackway to pulverizethe material suppliedto the mill, a subjacent incline for receiving thematerial to be pulverized and supplying it to the trackway, incombination with a fan chamber located above the die and in directcommunication therewith, a fan chamber located below the die and incommunication with the upper chamber, fans contained in both fanchambers, and a screen interposed between the two fan chambers,substantially as described.

3. In a pnlverizer mill, a die section consisting of a trackway and aseries of pulverizer balls cooperating with the trackway to pulverizethe materiahsupplied to the mill, a subjacent incline for receiving thematerial to be pulverized and supplying it to the -trackway, a fanlocated below the die section and a chamber within which said tanrotates. said chamber being in communication with the die, and a screeninterposed between the die and the tan chamber, su'bstan tially asdescribed.

4. In a pulverizer mill, a die. pulverizer' balls cooperating therewith,a fan located above the die, a fan chamber within which said fanrotates, a'screen-through whichthe pulverized material raised by the fanis floated, a fan chamber below the die and 1n compartment of the milland float communication with the fan chamber above the die, and a fancontained withinsaid' the die, and a fan contained within said.

lower tan chamber, said fan-consisting'of a series of blades tangent attheir inner ends. to a common circle, said blades being inclinedoutwardly and rearwardly to a point beyond the inlet for the air fromthe upper chamberf'aiid being provided beyond that point with a coverplate; substantially as de scribed.

6. In a pulverizer mill. a die, pulvcrizer bal-ls coperating therewith,a fan located above the die, a fan'chamberwithin which said fan rotates,a screen through which the pulverized material raised by the tan isfloated, a fan chamber below the die and in communication with the fanchamber above,

the die, and a fan contained within said lower fan chamber, said fanconsisting of a' series of blades tangent at their inner ends to acommon circle, said blades being in clined outwardly and rcarwardly to apoint beyond the inlet for the air from the upper chamber, and beingprovided beyond that point with a cover plate, said cover plate being.downwardly inclined; substantially as described.

I 7. In a pulverizer mill, an upper screen section. provided with acover, depressed at its central portion to form a downwardly dependingbearing projecting into the screen section, and provided with a bushingfor the upper part of the shaft of the mill; substantially as described.

8. In a pulverizer mill having ,a screen through which the pulverizedmaterial is ejected from the milling chamber by. an ejecting fanoperating within said chamber, an exhaust fan located outside of saidchamher and said screen, and serving to supplement-the expelling actionof the ejecting fan in passing the pulverized material through saidscreen and from 'thefmill; substantially as described. i

-9. In a pulverizer mill having a screen through which the pulverized.material is ejected from the milling chamber y an ejecting fanoperating within'said cha her, a fan chamber communicating with aidmilling chamber through said screen and an exhaust fan operating in saidfan chamber which exhaust fan has the capacity tolaid in expelling thepulverized material from the milling chamber through said screen andfrom the mill byway of said fan Chamber; substantially as described. v I10. In a pulverizer mill having a screen 5 through which the pulverizedmaterial is ejected-from the milling chamber by a fan on the main shaftoperating within said chamber, a fan chamber concentric with saidmilling chamber and separated therefrom by said screen, and an exhaustfanwithin said. fan chamber and on said main shaft,

the capacity of which exhaustfan permits it to aid in expelling thepulverized material. from the milling; chamber through said screen andfrom the millby way cit-said fan mf amilling chamber having a racewayand pnlverizer balls within its lower part, a eylindrical screeninclosing said chamber above said raceways and balls, va vcover-platehav ing a central downwardly directed chute ex* tending within saidchamber, a shaft bearing located within and encompassed by said chute,and a fan operatingbetween said screen and said chute; substantially asdescribed.

' 13.'In a pulverizer mill, the contib'lnationv with a milling chamberpartially inclosed by a screen,"of an exhaust fan chamber sub 40 jacentto saidmilling chamber, art-annular chamber encorhpa ssmg said millingchamber and communicating therewith through said,

screen, and inwardly .and outwardly in clined passages afiordingcommunication be tween said annular chamber and the central I .part ofsaid exhaust 'fan chamber; substam tially as described. Q

1 1. .In a pulverizer mill, the combination of a dome-shaped exhaustfan. chamber, a dome-shaped exhaust iani'mounted in said exhaust fanchamber and provided with tangential-blades, 'a milling chamber havin adomed bottom covering said exhaust an chamber, an annular -.chamberencompassing said milling chamber and communicating therewith throughascreen, and downwardly andinwardly inclined passages leading from i the"bottonr of. saidannulan chamber to the central' part of said exhaustfan cha substantially as described.

In testimony whereofl aflix my signature.

in pres'ence of two witnesses. IA-IWES W. F LLER, JR.

Witnessesii I-JOHN C. PENNIE, Fnaxx A, Hnxxnssr.

